Thomas h



THOMAS H. ,SAVERY, OF WILMINGTON, DELAWARE.

'Letters Patent No. 78,763, dated Jtme 9, 1868. l

IMPROVEMENT INIXPANDING-PULLBY.

dite .estende wenn tt in tigen Enters rztin zint mating tnt nf its anni.

TO WHOM IT MAY CONCERN:

Be it known that I, THOMAS HSAVERY, of Wilmington, in the, countyof'New' Gastle,and State of Deia'- ware, have invented al new andvimproved Expanding-Pulley; and I do herebyl'declare that the followingis a full, clear, and exact description thereof, which will enableothers skilled in the art to make and use the same, reference being hadto the accompanying drawings, forming partot' this specification.

Figure 1 is a 'side view ,of myvimproved,expanding-pulley. I

Figure 2 is a section of the saine, through the'line :v a: of iig..

Figure 3 is a detail view of the scroll-disk and one rim, showing themanner in which the teeth of the arm engage with the spiral scrollof thedisk. v

Similar letters of`reference indicate' corresponding parts. v v

The object of this invention is to increase o i" lessen the velocity ofmachinery driven by a belt and pulley, which 'is-raccomplished' byexpanding or contracting the'rim ofthedriving-pulley, so as to increaseor lessen the angular velocity of the saidrimwith agiven'velocity of the'shaftbe'aringthe pulley.

This invention is designed more particularlyrv for regulating thespeed'of coo'ch rorV calender1'o l1s..0f.

paper-mill machinery, the speed of whichjrolls: it is desirabletoregulate by some convenient and expeditious Vmanner while the rolls arein motion.

This I accomplish `by means of an expanding-pulley, the sectional rimsof whichV are thrown out or drawn' in radially by means of a` spiral orscroll slot in the facesof a disk, which latter revolves on the shaft ofthe pulley, and is engaged by corresponding teeth on the proximate faceof the arms, forming part ofthe sectionalrims composing therim of thepulley,l l

The scroll-disk is connected, by a suitable train of toothedorfriction-wheels, with a hand-wheel', having free motion on the shaftnfl-the pulley, and by holding this hand-wheel from revolving with. thepulley, the rims' are expanded or contracted according to' the directionin which the pulley is rotating. i

The train of gear-wheels, connecting the scroll-disk with thehand-wheel, may be variously modified without a'ecting lthe same general-result; but I will setforth a simple and effective manner by which thehand-wheel and scroll-disk may be connected to accomplish theperfectworking of the invention. l

The hand-wheel E is fitted with easy contact on-the shaft D of thepulley, and the hub of the hand-wheel is produced and formed into apinion, a, or the said pinion may be made-'separately 'and ai'lixedtothe hub.

The pinion a engages with a toothed wheel, b, the arbor, e, oflwhichbears a pinion, d, which, in turn, engages with the toothed periphery ofthe scrollfdisk A, which latter `revolves freely on the shaftD.- Thearbor e of the wheel In, and pinion 01,'has a bearing in thelange-plate(i-` of th,` hub ofthe pulley, and this bearing is` continuedthrough the sector-blocks, which are spaced apart around the face of thehub-Harige,- and'thus form the radial slots, in whichA the arms 4B ofthe sectional rims C work. These slots, however, may, in practice, beplaned into a hubfilange, cast originally of suiicient'thiclrness forthat'lpurpose.

The arms B fit with inisbed'contact within the said'slots, and'slide inVtheA same as the rims C are-'expanded or contracted. This expansive andcontractile movement is 'accomplished by means of teeth, formedfon orVntiixed to the faces of1the arms, and which work with easy contact inthe vspiral slot or scroll formed in the proximate face ofthe disk A,avs'shown at fin iig. 1, but better showuat the detail view of iig. 3.`v

A fillet or annular plate H-is'ailixed tothe hnbflange, and this servesto enclose-the arms in their respective slots. The pinion 0l `is'locate-d in a circular recess, formed in the plate H, thc said recessopening inwardly toward the centre of the pulley, thereby permitting theengagement of the pinion with the disk:

This` recess is shown partially dotted .at fig. I. The disk A is withinthe plate H, and the pulley is not materially encumberod bythe'geur-mechanism. p I artsof the hand-,wheel and'wheel b are brokenaway in fig. VIl, the better to show other` parts ofthe invention.

Having described thy-invention, YI clamasnew, and desire to secure byLetters Patent- The expanding-rims, C, of a pulley, operated ,bv meansof o. hand-wheel, E, and scroll-disk A, both working on the pulley-shaftD, and connected -by any suitable train of gear-wheels, substantially asshown and described.,

The above specification of my'v invention signed by'me, this 2d day ofApril, 1868.

v Tues. H. sunny.

Y Witnesses:

F. G. WILMANs, WM. Gr..4 Gxnons.

